Basso Astra Ultegra Di2 Cosmic S Cobalt Grey

Basso Astra Ultegra Di2 Road Bike, Cosmic S, Cobalt Grey

£4,499.00

Cycle to Work: pay £2,609 to £3,239

Save 28% to 42% on this bike with Cyclescheme or the Green Commute Initiative, depending on your tax band. We handle the paperwork. How it works

ColourCobalt Grey

Size XS S M L

Power Meter Without power meter With Magene power meter crank

Free collection from the shop, or fully built delivery to your door.

Built, safety checked and road tested by our mechanics before it leaves us. No box, no assembly, no build fee at the other end. England and Wales.

Read the full delivery details

Two ways to get your bike

Free collection from the shop

Pick it up at 4 Corsican Square, London E3 3XS. Built, checked and ready to ride. No charge.

Fully built delivery to your door

Your bike is built, safety checked and road tested by our mechanics before it leaves the shop, then carried on a padded rack in a specialist van. It arrives ready to ride.

Why that matters

Most online bike retailers ship a bike flat packed in a box. You unpack it, fit the bars, the wheel, the pedals and the seatpost, then set the gears and the brakes yourself, or you pay a local shop around £60 to build and check it for you. Get it wrong on a brake or a torque setting and it is not a small mistake. Self assembly can also invalidate your manufacturer warranty: most brands require the bike to be built and handed over by an authorised dealer.

With us the bike is finished before it moves. No box, no assembly, no build fee at the other end, no packaging to get rid of, and your warranty intact.

What you get

Built and safety checked by our mechanics, not by you
Manufacturer warranty valid from day one
No box and no reassembly
Carried on a padded rack, never boxed or stacked
Fully insured in transit
Live tracking, plus a 3 hour delivery window the day before

Where we deliver

England and Wales. Everywhere else, including Scotland and Northern Ireland, is collection from the shop for now. Get in touch and we will quote you a courier.

4.9 from 782 Google reviews
Independent Bike Dealer of the Year 2025, BikeBiz Awards
Fully built delivery to England and Wales, or free collection from our Bow shop at E3 3XS.
Built, safety checked and road tested by our mechanics before it leaves us

Collecting instead? Email us or message us on WhatsApp before you visit, so we can have it ready for you.

An Italian All-Road Bike for Every Day, Not Just Race Day

The Basso Astra keeps its road racing DNA but adds the stability and comfort that real riders want every day. Compared with the previous Astra the stack is 12mm higher and the reach 3mm shorter, the seatstays are dropped, and there is room for 35mm tyres so you can leave the tarmac for light gravel. It is UCI approved and handmade in Italy.

This build runs Shimano Ultegra Di2 12-speed with hydraulic discs on Mavic Cosmic S wheels. Cables are fully integrated through Basso's Paradigma system, so the stem can be swapped or removed without disconnecting anything. You can also order it with a Magene power meter crank fitted.

Why we chose this for our customers:

980g Italian carbon frame: Toray high modulus carbon, made in house at Basso in Italy, with a 2 year warranty.
Shimano Ultegra Di2 12-speed: Electronic shifting with hydraulic disc brakes and 160mm ICE rotors.
All-road ready: Room for 35mm tyres, dropped seatstays and a more relaxed position for long days.
Easy to live with: Paradigma integration keeps steering light and makes cockpit changes simple, with a hidden 3B seat clamp.

Specification

Frame: Toray 3K high modulus carbon, made in Italy, 980g
Groupset: Shimano Ultegra Di2 12-speed, 105 12-speed cassette
Rotors: Shimano Ultegra ICE, 160/160mm
Wheels: Mavic Cosmic S Centre Lock Disc UST
Tyres: Schwalbe One Performance TLE 700 x 30c
Handlebar: Microtech All Road
Stem: Basso Paradigma
Seatpost: Basso Integral carbon, 3B Clamp Gen 2
Saddle: San Marco Monza
Bottom bracket: BB86 86.5 x 41
Tyre clearance: up to 35mm
Power meter option: Magene power meter crank
Warranty: 2 years from Basso
Sizes available to order: XS (48cm), S (51cm), M (53cm), L (56cm)

Sizes XXS (45) to XXL (61). Spec may change slightly with supplier availability.

Ideal for: riders who want one fast, comfortable road bike for training, sportives and the odd gravel detour.

Every bike we sell is built, safety checked and road tested in our workshop at 4 Corsican Square, Bow. Come in to talk sizing before you order, spread the cost with the Cycle to Work scheme, or have it delivered fully built. See the rest of the Basso range and our other road bikes.